Initial exploration of clinical value for diagnosing in tracranial aneurysms with multi-slice helical CT three-dimensional angiography / 中华放射学杂志

ABSTRACT

Objective To evaluate the clin ical value of Multi-slice helical CT three dimensional angiography (3D-MSCTA) as first method for diagnosing intracr anial aneurysms. Methods We studied patients with clinical suspected intracranial aneurysms (13 patients with subarachnoid hemorrhage among cases). All these patients under went 3D-MSCTA and Digital Subtraction Angiography (DSA), 16 patients of them accepte d operation treatment. Row data was acquired by Multi-slice helical CT-AQUILION (Toshiba) scan speed 0.5 s/rot, image slice thickness 1.0 mm, helical pitch 3 .0/5.0. Contrast media (Angiografin) was injected intravenously (1.0-2.0 ml/kg) at spee d of 2.5-3.0 ml/s, delay time was 15-23 sec, reconstruction interval 0.5 mm, recons truction slice thickness 1.0 mm. Source images were processed using a workstation SGI-O2 , images post-processing software was ALATOVIEW,Version 1.21. The reconstructed images were then processed into shaded volume rendering (SVR) and maximal intensity projection (M IP) and Fly-through images. Entire brain DSA was performed obtaining anterioposteri or, lateral, and oblique images. Images of 3D-MSCTA and DSA were analysed by 3 radiologists and 2 neurosurgeons. Results 25 aneurysms were d etected by 3D-MSCTA. Aneurysms′s body, neck, source vessel and the relationship between the aneurysm and surrounding structures was clearly and surely displayed. 22 of 25 aneurysms were detected by DSA,another 3 were (1 anterior communicating artery aneurysm and 2 left middle cerebral artery aneurysm) was not detected. Sixteen of patients un derwent operation treatment, and the results of 3D-MSCTA corresponded very well to those of operation. Maximal diameter of aneurysms body was 14.0 mm and minimal diameter w as 1.7 mm. Conclusion 3D-MSCTA is a high sensitivity and rapid and no ninvasive method for detecting intracranial aneurysms. We suggest that 3D-MSCTA may be the first cho ice for diagnosing intracranial aneurysms.